Provided is an active filter circuit connected to a power-receiving terminal of a power line for an alternating-current power supplied to a power converter device from an alternating-current power grid or a direct-current power source interconnected with the alternating-current power grid, or for a direct-current power supplied from the direct-current power source for reducing a harmonic component of a conduction noise propagating to the power line and outputting the reduced harmonic; and a controller for monitoring a variation in the state of an input power entering a power source module for generating drive power for an active element constituting the active filter circuit, or a variation in the state of the drive power supplied from the power source module, and diagnosing an abnormality of a circuit operation for a circuit including the active element of the active filter circuit therein.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The noise filter according to claim 1, wherein when the controller diagnoses that the abnormality has occurred in the circuit operation of the circuit including the active element of the active filter circuit therein on the basis of the variation in the state of the drive power, the controller suspends an operation of the power converter device.
3. The noise filter according to claim 1, wherein when the controller diagnoses that the circuit operation of the circuit including the active element of the active filter circuit therein is normal on the basis of the variation in the state of the drive power, the controller continues an operation of the power converter device.
4. The noise filter according to claim 1, wherein the controller diagnoses the abnormality in the circuit operation of the circuit including the active element of the active filter circuit therein on the basis of the first current or the second current, and the third current.
5. The noise filter according to claim 1, wherein the controller diagnoses that the circuit operation of the circuit including the active element of the active filter circuit therein is normal when the first current or the second current is at or above a first threshold and is at or below a second threshold that is greater than the first threshold.
6. The noise filter according to claim 1, wherein the controller diagnoses that the circuit operation of the circuit including the active element of the active filter circuit therein is normal when the third current is at or above a third first threshold and is at or below a second threshold that is greater than the first threshold.
7. The noise filter according to claim 1, further comprising a passive filter for the power line which is supplied the alternating-current power supplied to a the power converter device from the alternating-current power grid or the direct-current power source interconnected with the alternating-current power grid, or is supplied from the direct-current power source on the power converter device side, for reducing common mode noise propagating to the power line.
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December 16, 2020
May 14, 2024
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